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15. STOCK OPTIONS (Details Narrative) (USD $)
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Compensation expense $ 20,835us-gaap_StockOptionPlanExpense $ 23,503us-gaap_StockOptionPlanExpense
2011 Stock Incentive Plan    
Options to purchase common stock under 2011 Stock Incentive Plan 12,900,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_AwardTypeAxis
= VSUL_StockIncentivePlanMember
 
Average exercise price under 2011 Stock Incentive Plan $ 0.125us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_AwardTypeAxis
= VSUL_StockIncentivePlanMember
 
Unrecognized costs related to employee granted stock options that are not vested $ 308,565us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= VSUL_StockIncentivePlanMember
 
Period for recognition 5 years 1 month 2 days